Can I put plastic in the dishwasher?

Find out what types of plastic can go in the dishwasher and how to wash your plastic items without damaging them, with Finish®.

Author: Finish® Canada

A woman and a child unloading a dishwasher in a cozy kitchen. The woman smiles as she hands a yellow plate to the child.

Plastic is found everywhere in our kitchens. There’s the tough, durable kind that lunchboxes and knife handles are made from; the soft pliable type; and the slim clear sort that’s often used for food containers or plastic bottles. But the question remains: can plastic go in the dishwasher without damage?

The answer depends on the type of plastic, whether it carries a dishwasher safe symbol, and how you load it.

WHAT DOES “DISHWASHER SAFE” MEAN?

When an item has a dishwasher safe symbol, it means the manufacturer has tested it to withstand dishwashing heat, water pressure, and detergents.

Common dishwasher safe signs include:

Icon of a blue dish and glass under falling droplets, suggesting washability or dishwasher safety
A square with plates and water droplets (general dishwasher safe symbol)
Icon of two plates with water lines above, symbolizing washing. Text below reads "Dishwasher safe on top rack"
A version where the spray only hits the top (suitable for dishwasher top rack only)
Recycling symbol with three blue arrows forming a triangle around the number "5". Label below reads "PP"
Recycling code #5 or PP-polypropylene (one of the most heat-resistant plastics)

If there’s no dishwasher safe icon or label, assume it’s not safe. This helps avoid warping, cracking, or chemical leaching.

Can BPA-free plastic go in the dishwasher?

BPA (bispenol A) is a chemical once used to harden plastics. It can leach into food when heated, which may be damaging to our health when consumed. That’s why many modern plastics are now BPA-free.

If your plastic item is labelled as BPA-free and carries a dishwasher safe symbol, it should be fine to go in the top rack. But be wary: some companies claim their products are BPA-free, yet use substitutes like BPS, BPF, or BPAF that carries similar health risks. As such, it’s best to check if the product is truly BPA-free before putting it in the dishwasher.

A red container lid with embossed text reading "Phthalate & BPA free" in focus.

DISHWASHER SETTINGS FOR PLASTICS

Even if your plastics are labelled with the dishwasher safe symbol, how you wash them makes all the difference. The right cycle and placement can help your plastic containers go in and out of the dishwasher clean and undamaged.

Some dishwashers have cycles designed for plastics, with lower heat and gentler action to avoid damage. If yours doesn’t, you can try these dishwasher settings below.

How to load your dishwasher

Video tutorial: How to load your dishwasher

A close-up shot of a person filling up the dishwasher’s rinse aid chamber with Finish®.

FREQUENTLY ASKED QUESTIONS

Packshot of Finish Quantum Ultramax
SIGN UP FOR SAVINGS